Used one in a previous life....seemed to work great. Have one on a new design..not that part number...20A part...soic8.....and yes...easy..for my design..100mV/amp change, nominal 2.5V center. For higher temps...believe they make an automotive grade? But yes...add a cap, a pullup to 5V and you get the change in the voltage. In my case, I'm looking for a motor stall current so I dont need to carefully monitor. Marcel Duchamp wrote: Bob Axtell wrote: > Part number is ACS750SCA050 . > > With 5V in, provides a nom 2.5V output with no current > flowing. The chart indicates high accuracy in either direction > out to 50A. Insertion R is 130uOhm. Looks like all I have to > do is to acquire the 2.5V level when powering up (assuming > no current flow). > > The specs are so good I am skeptical. Anybody? > > --Bob Check the specs over the temp range you would be encountering, Bob. I've been looking at the Allegro current sensors but the temperature range spec I've been seeing approaches +/-11% error band. If that's not a problem for your application, then they have a lot going for them, low sense resistance being number one. One possibility would be to try to temp-compensate them, although it looks like they already have so you might be facing residual errors which are usually 2nd or 3rd order. If you investigate further let us know. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist --------------------------------- Cheap Talk? Check out Yahoo! Messenger's low PC-to-Phone call rates. -- http://www.piclist.com PIC/SX FAQ & list archive View/change your membership options at http://mailman.mit.edu/mailman/listinfo/piclist